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    Home > Exchange Online to Exchange Online Migration Process > Preparation > 12. Migration throughput

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    12. Migration throughput

    For email migrations, generally, a reasonable migration speed is 1.5 GB/hour/mapping. For the number of mappings that can be run, it is automatically allocated based on the subscription you purchased. The more user seats you purchase, the more mappings you can run in a project.

    There are many factors which may affect migration performance:

    - The above throughput number is for full migration. Generally, it may be lower for incremental migration since Fly needs to spend quite some time in checking the migrated item status for incremental migration. - There may be throttling issues in the source and destination, which affect the migration performance.